"The antioxidants in fruits and vegetables protect the brain from oxidants that damage delicate cell membranes and brain cells, and may cause dementia," Somer says. "Maintaining a high antioxidant level is important for cognition and memory."

Look for darker colored fruits and vegetables for highest levels. Most nutritionists name blueberries as the ultimate antioxidant powerhouse.

"Vitamins like B-6 and B-12 are important in maintaining your nervous system in general and are associated with improved memory and alertness," Somer says.

While B-12 and folic acid (folate) are best absorbed in supplement form, she says, "be aware that as you get older you need more B-12. Foods like spinach, broccoli, or beans are a good source of folate."

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